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Internal Medicine Providers in Buffalo Grove, IL

Browse 24 Internal Medicine providers listed in NPPES with a practice address in Buffalo Grove, Illinois.

24 Healthcare Providers

How Buffalo Grove compares with the U.S.

Buffalo Grove has 56 clinicians in Internal Medicine per 100,000 residents, about 1.3 times the U.S. rate of 44.

That is 24 active clinicians in Internal Medicine with a practice address in Buffalo Grove, for a population of 42,891.

That is close to the Illinois rate of 57.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

94% of clinicians in Internal Medicine in Buffalo Grove listed in the CMS Medicare file (16 of 17) accept Medicare assignment. That is similar to the Illinois share of 96%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

65% of clinicians in Internal Medicine in Buffalo Grove listed in the CMS Medicare file (11 of 17) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the Illinois share of 35%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Internal Medicine Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Internal Medicine practitioners in Buffalo Grove, IL

Source: CMS PECOS
PECOS Enrolled Specialists 19 In Buffalo Grove, IL
Part B Lab & Imaging Eligible 19 Diagnostic Referrals
DME Ordering Eligible 19 Durable Medical Equipment
Home Health Agency Referrals 19 HHA Ordering Eligible
Showing 1โ€“20 of 24 providers
With recent CMS data first, then Aโ€“Z

Dr. Hoyee Chan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 Mchenry Rd, Town Center Shopping Center, Buffalo Grove, IL 600896740
Phone: 8475209424
NPI Identifier 1336208297
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Dr. David S Charman , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
600 W Lake Cook Rd, Buffalo Grove, IL 600892089
Phone: 8476321880
NPI Identifier 1346228954
View Full Profile

Dr. Mark J Charman , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
600 W Lake Cook Rd, Buffalo Grove, IL 600892089
Phone: 8476321880
NPI Identifier 1033197637
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Dr. Stuart S Ferber , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
15 S Mchenry Rd, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1952389413
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Dr. Margaret H Fruhbauer , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
15 S Mchenry Rd Fl 2, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1851557102
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Dr. Irina Goldvekht , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
15 S Mchenry Rd, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1154309755
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Dr. Leo Gutt , MD

Internal Medicine

Active NPI Status
3011 Bayberry Dr, Buffalo Grove, IL 600896633
Phone: 6305427895
NPI Identifier 1801945480
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Dr. Thomas A Heggen , MD

Internal Medicine

Active NPI Status
1300 Busch Pkwy, Buffalo Grove, IL 600894505
Phone: 8478505882
NPI Identifier 1710974860
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Dr. Gabriel Kibrit , MD

Internal Medicine

Active NPI Status
1450 Busch Pkwy # 100, Buffalo Grove, IL 600894541
Phone: 8474597860
NPI Identifier 1477531937
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Dr. Lidiya Kupriyenko , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 W Lake Cook Rd, Buffalo Grove, IL 600892082
Phone: 8474591160
NPI Identifier 1942487772
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Dr. Carl R Lang , MD

Internal Medicine

Active NPI Status
600 W Lake Cook Rd, Buffalo Grove, IL 600892089
Phone: 8476321880
NPI Identifier 1730167339
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Dr. Wendi G Marcus , MD

Internal Medicine

Active NPI Status
15 S Mchenry Rd, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1548249113
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Dr. Della Mathew , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
150 W Half Day Rd, Suite 103, Buffalo Grove, IL 600896591
Phone: 8479551144
NPI Identifier 1629028428
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Dr. Susan E Nelson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
15 S Mchenry Rd, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1144208612
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Dr. Michael J Unger , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
650 W Lake Cook Rd, Buffalo Grove, IL 600892082
Phone: 8474591160
NPI Identifier 1518945484
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Dr. Lena Virasch , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
15 S Mchenry Rd, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1780094714
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Dr. Chuck Richard Vrasich , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
15 S Mchenry Rd, Buffalo Grove, IL 600896705
Phone: 8476180351
NPI Identifier 1114214111
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Dr. Heidi Wehlus , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1450 Busch Pkwy Ste 110, Buffalo Grove, IL 600894541
Phone: 8474952311
NPI Identifier 1912163130
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Dr. Olga Zarkh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
135 N Arlington Heights Rd Ste 160, Buffalo Grove, IL 600898216
Phone: 8478187700
NPI Identifier 1043282320
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Dr. Oksana Batejko , MD

Internal Medicine

Active NPI Status
1215 Mchenry Rd, 130a, Buffalo Grove, IL 600891370
Phone: 8472239494
NPI Identifier 1427153477
View Full Profile

Frequently Asked Questions about Internal Medicine in Buffalo Grove

How do I check a Internal Medicine practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the Illinois licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.

Other Specialties in Buffalo Grove

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